Ian K. Smith is an American author, physician, and media personality. He is best known for his books on health and nutrition, including the New York Times bestsellers Shred: The Revolutionary Diet and The 4 Day Diet. He is also the author of the #1 New York Times bestseller, The Fat Smash Diet. Smith has appeared on numerous television shows, including The Dr. Oz Show, The View, and Good Morning America. He is a graduate of Harvard University and the University of Pennsylvania School of Medicine. He is a member of the American College of Physicians and the American College of Nutrition. Smith is committed to helping people lead healthier lives through nutrition and exercise.